Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of treating titanium dioxide waste acid of sulfuric acid method using ferrous sulfate

A technology of ferrous sulfate and titanium white waste acid, which is applied in the field of titanium dioxide, can solve the problems that have not been completely solved and the blockage of graphite heaters, so as to avoid the use of boilers and evaporators, reduce pressure, and improve the working environment Effect

Inactive Publication Date: 2019-07-19
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the difficult problem of graphite heater blockage in the evaporation and concentration process has not been completely solved so far.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 100 grams of sulfuric acid process titanium dioxide hydrolysis waste acid contains 20% sulfuric acid and 2-3% ferrous sulfate.

[0040]The first step: 100 grams of waste acid and 62 grams of ferrous sulfate monohydrate are mixed at normal temperature. After keeping for a certain period of time, the solid-liquid separation obtains 57 grams of liquid phase, and the concentration of sulfuric acid rises to 35%; obtain about 106 grams of solid phase, The solid phase is ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O), after drying at 70°C to 100°C to remove 6 crystal water, return to use;

[0041] Second step: add 344 gram of ferrous sulfate anhydrous in the 57 gram liquid phases of first step gained, mix under normal temperature, after keeping certain hour, solid-liquid separation obtains 36.4 gram liquid phases, and sulfuric acid concentration is raised to 55%; Obtain about 385 grams of solid phase, the solid phase is ferrous sulfate monohydrate (FeSO 4 ·H 2 O), after dry...

Embodiment 2

[0044] Mix 100 grams of sulfuric acid titanium dioxide hydrolysis waste acid, which contains 20% sulfuric acid and 2-3% ferrous sulfate, with 510 grams of anhydrous ferrous sulfate at room temperature, keep it for a certain period of time, and separate the solid and liquid to obtain 36.4 gram liquid phase, sulfuric acid concentration is raised to 55%; Obtain about 571 gram solid phases, and this solid phase is ferrous sulfate monohydrate (FeSO 4 H2O), after drying at 300°C to 350°C to remove crystal water, return to use.

[0045] The obtained liquid phase with a mass concentration of sulfuric acid of 55% can be returned to acid hydrolysis for continuous acid hydrolysis; or be concentrated to greater than 60% with flue gas and returned for intermittent acid hydrolysis.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of titanium dioxide, and particularly relates to a method of treating titanium dioxide waste acid of a sulfuric acid method using ferrous sulfate. The method of treating titanium dioxide waste acid of the sulfuric acid method using ferrous sulfate comprises the following steps: two-step method: firstly, mixing and placing ferrous sulfate monohydrate andwaste acid, performing solid-liquid separation to form a solution in which a mass concentration of sulfuric acid is 35-38%, and secondly, mixing and placing anhydrous ferrous sulfate and the solutionin the first step, performing solid-liquid separation to form a solution in which the mass concentration of sulfuric acid is 50-55%; or one-step method: mixing and placing anhydrous ferrous sulfate and waste acid, and performing solid-liquid separation to form a solution in which the mass concentration of sulfuric acid is 50-55%. The method of treating waste acid effectively utilizes waste raw materials generated by titanium dioxide production, can also relieve pressure caused to an environment, improves a working environment and has very good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide, and in particular relates to a method for treating titanium dioxide waste acid from a sulfuric acid process with ferrous sulfate. Background technique [0002] Titanium dioxide is an excellent white pigment, which is widely used in paints, coatings, paper, plastics and welding electrodes and other industries. [0003] At present, the processes for producing titanium dioxide mainly include the sulfuric acid method and the chlorination method. The two processes coexist, and the production capacity and output are very large. Yet these two kinds of production processes all have certain environmental pressure, for sulfuric acid production process, will produce a large amount of hydrolysis waste acid and the vitriol (FeSO 4 ·7H 2 O). When using titanium concentrate (the main component is iron metatitanate FeTiO 3 , wherein the titanium dioxide content is 45 to 50% by weight) as raw materia...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88
CPCC01B17/88
Inventor 穆宏波穆天柱邓斌
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD